STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE: 12
J1587 CODE: P1873 - POWER TAKE OFF (PTO) INPUT FAILED HIGH (HIGH VOLTAGE)
(ALSO CALLED VARIABLE SPEED GOVERNOR - VSG)
NOTE - This chart is only to be used if:
1) All basic mechanical checks and physical inspections have been performed with no problem found, and
2) Diagnosis of DDEC-III was started at step Start-1, pg 3-345.41 and you have now been referred here.
NOTE: REMOVE GROUND WIRE IF FITTED FROM CIRCUIT 510 BEFORE PERFORMING THESE CHECKS!
12-1 Multiple Code Check
Were there any other active codes
No other active codes
Go to 12-2.
besides Code 187/3?
Yes, either code
Go to VEH5V-1, page 3-345
91/3 or 4
419.
Yes - but none
Go to 12-2.
of the above.
12-2 Sensor Check
Turn ignition off.
Any codes
Go to 12-3.
Unplug the PTOSA sensor
except Code 187/3.
connector.
Turn ignition on.
Code 187/3 (and any
Go to 12-5.
Read active codes.
other codes).
12-3 Return Circuit Check
Transmission in neutral.
Less than or
Go to 12-4.
Turn ignition off.
equal to 5 ohms.
Install a jumper wire between pin
A and pin B of the PTOSA
Greater than
Return line (ckt#952) is open.
harness connector.
5 ohms or open.
Repair open. Then go to
12-30.
Disconnect the vehicle harness
connector at the ECM.
Read resistance between sockets
C3(952) and D1(510) on the
vehicle harness connector.
12-4 Check PTOSA
Connectors
Inspect terminals at the PTOSA
Terminals and
Recalibrate PTOSA. If not
connectors (sensor side and
connectors are okay.
recalibratable or does not fix
harness side) for damage; bent,
problem then replace PTOSA
corroded, and unseated pins or
sensor. Then go to 12-30.
sockets.
Problem found.
Repair terminals/connectors.
Then go to 12-30.
Change 3 3-345.189
